CVE-2025-62907 identifies a Stored Cross-Site Scripting (XSS) vulnerability in the Custom Post Type Attachment plugin developed by aviplugins.com, specifically affecting versions up to and including 3.4.6. The vulnerability stems from improper neutralization of input during web page generation, meaning that user-supplied data is not adequately sanitized or encoded before being rendered in the HTML output. This allows an attacker with low privileges (PR:L) to inject malicious JavaScript code that is stored persistently within the application, such as in post attachments or metadata fields. When other users or administrators view the affected pages, the malicious script executes in their browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed with the victim’s privileges. The CVSS vector indicates network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), and user interaction (UI:R), with a scope change (S:C) meaning the vulnerability affects resources beyond the initially compromised component. The impact is limited to partial confidentiality and integrity loss (C:L/I:L), with no availability impact (A:N). No public exploits have been reported yet, but the vulnerability is published and should be considered for immediate remediation. The plugin is commonly used in WordPress environments to manage PDF attachments as custom post types, which are prevalent in content-heavy websites. The lack of available patches at the time of disclosure necessitates interim mitigations to reduce risk.

For European organizations, this vulnerability poses a moderate risk primarily to websites and web applications using the Custom Post Type Attachment plugin on WordPress. Successful exploitation can lead to theft of sensitive user information, session tokens, or unauthorized actions performed on behalf of legitimate users, potentially compromising user accounts and administrative functions. This can result in reputational damage, data breaches, and regulatory non-compliance, especially under GDPR requirements concerning personal data protection. The vulnerability’s requirement for some level of user privileges and user interaction limits mass exploitation but does not eliminate risk in multi-user or collaborative environments such as corporate intranets, educational platforms, or government portals. Organizations relying on this plugin for document management or content delivery should be aware that attackers could leverage this flaw to escalate privileges or pivot to further attacks within their networks. The absence of known exploits in the wild provides a window for proactive defense, but the public disclosure increases the likelihood of future exploitation attempts.

1. Monitor for official patches or updates from aviplugins.com and apply them immediately once available to remediate the vulnerability. 2. Until patches are released, implement strict input validation and output encoding on all user-supplied data related to custom post type attachments to prevent malicious script injection. 3. Deploy a robust Content Security Policy (CSP) to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 4. Limit user privileges to the minimum necessary, especially for users who can upload or modify attachments, to reduce the attack surface. 5. Conduct regular security audits and code reviews of custom plugins and themes to identify similar input sanitization issues. 6. Educate users and administrators about the risks of clicking on suspicious links or interacting with untrusted content within the application. 7. Utilize web application firewalls (WAFs) with rules designed to detect and block XSS attack patterns targeting WordPress plugins. 8. Maintain comprehensive logging and monitoring to detect anomalous activities that may indicate exploitation attempts.